Caught in the Act!

 One day after celebrating Jason Mesnick and Molly Malaney's nuptials,Bachelor alums Trista and Ryan Sutter spent a day by the pool at Terranea Resort on the coast of Rancho Palos Verdes, Calif., with their kids. While Max, 2 ½, had fun playing with his dad in the pool and the sandbox, Blakesley, 10 months, stayed close to her mom. "Trista looked amazing in a white bikini," a guest tells us, adding that Max was running around while Trista and her daughter lounged on a sunbed. Says the guest: "Trista and Ryan looked very happy together and even shared a few kisses."

 When Britney orders a Diet Coke, she wants a Diet Coke! Spears was hanging with pals at Station Hollywood, the outdoor lounge at W Hollywood, when she ordered a soda. Since they only serve Pepsi products, an employee ran down the street to bring the singer back her brand of choice. Spears then spent the rest of her night laughing and talking with friends, acting super relaxed and courteous.

 She's still celebrating! Days after her actual 29th birthday,Paris Hilton kept the party going at her L.A. home. The heiress threw a disco-themed bash and she and beau Doug Reinhardt sported matching blue Studio 54 outfits. Guests drank Vita Coco and Ciroc, and gathered in her dining room to sing "Happy Birthday" and toast Hilton.

 Avatar star Sam Worthington, dining at the bar at Dos Caminos Las Vegas with a beautiful young woman. He was very polite and kind to the staff, chatting with them while he ate guacamole and chicken tacos – over beers.